Foam tree stump prop build - Part 1

Time lapse of a quick build: A foam tree stump prop for Patel Conservatory. Cardboard and urethane insulation foam.
hackaday.io/page/4899-foam-tr...

[@alyssadyke2481]

This water tip just blew my mind. Thank you so much for sharing your knowledge!!!

[@hdb80]

Daren, you're incredible!

[@chasetrusnovec1895]

Daren thanks so much for this video! I really want to do something like this for my church. I was going to use a large styrofoam cylinder and styrofoam branches. Do I coat that with spray insulation and then use an epoxy hardner on top? or do I put the hardner on the styrofoam and then cover with spray insulation?

[@rattlecage666]

Fantastic.

[@JOE-ck1nb]

What white spray do you spray on paper?

[@natestolgic1]

How much spray did it take to cover this piece? I’m making a 16 foot tree and want to try to make as few trips to the store as possible.

[@DarenSchwenke]

Three cans if I recall correctly. Make sure you wear a chemical respirator if you are going to do that much, or at least have good ventilation. Isocyanates don't smell like they would require one, but a few hours of constant exposure can make you permanently sensitized to them with flu like symptoms.

[@natestolgic1]

Daren Schwenke thank you for responding so quickly and for the advice. I have a pretty well ventilated shop I’m working out off. Cluttered, but ventilated. I’m looking at buying at least 12 more cans then.

[@jcfsaiyan]

what are you spraying the foam with in the formula 401 bottle and why

[@DarenSchwenke]

Water. The urethane foam I use here is moisture cure, so spraying it with water accelerates the cure time from hours to minutes, and let's you apply it as thick as you want.

[@jcfsaiyan]

thank you so much for your quick response, i am making my wife a bodice/corset that looks like it was made from bark, and your video has helped me tons. thank you again

[@DarenSchwenke]

@@jcfsaiyan If you want something that looks like bark to wear, start with closed cell neoprene foam and wire brush it. Insulation foam for pipes, the soft, expensive kind.

[@jcfsaiyan]

what about eva foam, cause thats what im using with the spray foam will it make the same effect if i wire brush it?

[@DarenSchwenke]

@jeremiah fletcher Polyethylene foam works too, but is harder to make look right due to the larger cell size and open cell nature. I have not tried EVA foam, but I imagine it should work. The higher the density, the more brushing you need. Use a stiff bristle wire brush, and if it tears the foam in a linear way along the brush lines, keep going and it will look like bark eventually. Example: kzbin.info/www/bejne/nJ2miXaZqdRmndU